HomeMy WebLinkAboutSite Certifications - 10/26/2018 (2)BOULDER I FORT COLLINS I WINTER PARK
JVA, Incorporated
213 Linden Street
Suite 200
Fort Collins, CO 80524
Ph: 970.225.9099
Fax: 970.225.6923
Toll Free: 877.444.1951
Web site:
www.jvajva.com
E-mail:
info@jvajva.com
September 26, 2018
Mr. Wes Lamarque
700 Wood Street
Fort Collins, CO 80521
RE: Village on Horsetooth – Site Certification
JVA PN: 2595c
Dear Mr. Lamarque,
JVA has completed the review of the as-builts and completed the Certification Form & Checklist
for the Overall Site Drainage for the Village on Horsetooth project, located at 1506 West
Horsetooth Road in Fort Collins, CO. Based on our site visit observations and the topographical
information received, the overall site drainage characteristics as constructed are in substantial
conformance with the approved utility plans and drainage report.
The constructed improvements to the site adhere to the design intent in regards to detention
pond, inlets, storm drains, and LID basins as shown in the attached checklist and plans.
Final landscaping efforts are on going at this time of this certification, and erosion control
measures remain in place in all areas still to be planted or reseeded. Contractor is coordinating
with the City Erosion Inspector until work is completed and stabilization is achieved.
Please contact us if you have any questions, or need any additional information.
Sincerely,
JVA, INCORPORATED
By: ______________ ___________________
Brian J. Campbell, P.E
Regional Manager
Enclosures: Executive Summary, City of Fort Collins Overall Site Drainage Checklist, Approved
Original and As-built Grading & Storm Drain Plans, PLS Stamped Pond Survey
CC: Kristin Fritz, Housing Catalyst
Accepted 10/26/2018 WL
BOULDER I FORT COLLINS I WINTER PARK
JVA, Incorporated
213 Linden Street
Suite 200
Fort Collins, CO 80524
Ph: 970.225.9099
Fax: 970.225.6923
Toll Free: 877.444.1951
Web site:
www.jvajva.com
E-mail:
info@jvajva.com
September 26, 2018
Mr. Wes Lamarque
700 Wood Street
Fort Collins, CO 80521
Executive Summary: Village on Horsetooth – Site Certification
This letter is intended to summarize the design of the Village on Horsetooth grading and
drainage improvements and demonstrate that the constructed facilities are in substantial
conformance with the approved plans and Final Drainage Report for the Village on Horsetooth,
dated May 8, 2017.
A. Detention, Drainage Facilities, and Common Open Spaces
1. Water Quality and Quantity Detention Basin Certification
a. Design Summary:
As per the Foothills Basin Master Plan design, the site was graded in an attempt to
capture all site runoff to be treated and detained in three bioretention basins and
an extended detention pond located along the east side of the site. The detention
pond has an outlet structure that ties into the City’s existing storm sewer system
on the south side of Horsetooth. All onsite runoff, besides the detention pond, is
directed to one of the three LID ponds. The basins capture the site’s entire
required water quality volume with the assumption that the detention pond is a
mostly grass area which acts as a filter for the pond’s water quality needs. The
filter areas for each include 12 inches of growing media, 6 inches of pea gravel,
and at least 10 inches of CDOT Class C filler material with a 6” slotted
underdrain pipe along the bottom. The underdrain system is connected with
storm drains and ties into the outlet structure’s micropool. The on-site storm
system was designed to convey the 10-year storm event with the 100-year storm
event overflowing into the parking lots and sheet flowing into a LID Pond or
ponding until flow can by conveyed to an LID Pond.
b. As-built verification of water quality and detention facilities:
Topographic records were provided by R&R Surveyors detailing the elevations
and dimensions of the constructed concrete outlet structure, LID basin concrete
overflow weirs, and tops and bottoms of basin slopes. Redlined as-built plans as
well as the PLS stamped survey of the ponds have been provided for reference.
Scour stop mats are to be installed in lieu of riprap, and will be placed with final
landscaping. Constructed improvements are within substantial conformance with
the approved plans.
2. Swales
a. N/A
3. Pipes
a. As-built verification of storm pipes:
Topographic records were provided by R&R Surveyors detailing the invert and
rim elevations of storm manholes, inlets, and cleanouts. Size and material type
Village on Horsetooth
September 26, 2018
Page 2 of 4
were verified with engineer reviewed and approved product data submittals from
the contractor. Per the approved plans, some pipes were installed below the
minimum 0.4% slope due to tight site constraints and shallow cover. As-built
pipe velocities have been verified at a minimum of 2 feet per second and capacity
to convey the 10-year storm event. Constructed improvements are within
substantial conformance with the approved plans.
4. Concrete Pan Channels
a. As-built verification of pans:
Topographic records were provided by R&R Surveyors detailing flowlines of
concrete pans. Constructed improvements are within substantial conformance
with the approved plans.
5. Inlets
a. As-built verification of inlet structures:
Topographic records were provided by R&R Surveyors detailing the invert and
grate/flowline elevations of all storm inlets. Inlets types were installed per plan
and verified with engineer reviewed and approved product submittals from the
contractor. Constructed improvements are within substantial conformance with
the approved plans.
6. Culverts
a. As-built verification of culverts:
Topographic records were provided by R&R Surveyors detailing the as-builty
invert “in and out” elevations and sizes of storm culverts. Constructed
improvements are within substantial conformance with the approved plans.
7. Sub-drains
a. As-built verification of sub-drains:
Topographic records were provided by R&R Surveyors detailing the rims and
inverts of underdrain cleanouts, and underdrain system outfalls. Per the approved
plans, underdrain pipe slopes are not designed to meet the standard minimum of
0.4%, but are flat, as indicated on the drawings. As this underdrain functions by
capturing and conveying minor storm runoff that has infiltrated through the
bioretention bed, the perforated pipe functions properly to meet the design intent.
Constructed improvements are within substantial conformance with the approved
plans.
8. Curb Cuts
a. As-built verification of curb cuts:
Topographic records were provided by R&R Surveyors detailing the opening
width and elevation curb cuts. Constructed improvements are within substantial
conformance with the approved plans.
9. Sidewalk Chases and Culverts
a. As-built verification of sidewalk chases:
Topographic records were provided by R&R Surveyors detailing the opening
width and elevation of curb cuts. Constructed improvements are within
substantial conformance with the approved plans.
Village on Horsetooth
September 26, 2018
Page 3 of 4
10. Site Grading
a. As-built verification of site grading:
Topographic records were provided by R&R Surveyors detailing grading of all
common areas and rear property corners. Constructed improvements are within
substantial conformance with the approved plans.
11. Riprap
a. Per the approved plans, scour stop mats are used in lieu of riprap. Mats were
sized per manufacturer’s recommendations, and are to be installed 6” below
topsoil. At the time of this certification, scour stop mats have not been placed and
landscaping efforts are on going.
12. Permanent Erosion Fabric
a. N/A.
13. Post-Construction Site Cleanup
a. Street sweeping and gutter cleanup has been performed daily. Smoothing of ruts
in disturbed areas along with final landscaping is in progress at the time of this
certification. Reseeding and stabilization will be coordinated with the City
Erosion Inspector.
14. Certification of Other BMPs
a. N/A.
15. Certification of LID and Water Quality Features
a. As-built verification of LID basins:
Topographic records were provided by R&R Surveyors detailing basin elevations,
side slopes, bottom area and volume, spillway weir size and elevations, and
underdrain inverts. Constructed improvements are within substantial conformance
with the approved plans. Required inspection checklist provided with this
certification.
16. Certification and Erosion Control Measures
a. At the time of this certification, erosion control measures remain in all areas still
to be landscaped or reseeded. Landscaping efforts are ongoing and erosion
control measures will be removed upon stabilization. Contractor is coordinating
with City Erosion Inspector.
Village on Horsetooth
September 26, 2018
Page 4 of 4
Please contact us if you have any questions or need any additional information.
Sincerely,
JVA, INCORPORATED
By: ______________ ___________________
Brian J. Campbell, P.E
Regional Manager
Attachment A:
City of Fort Collins Site & Drainage Certification Checklist
8/16 Page 1
OVERALL SITE and DRAINAGE CERTIFICATION
Commercial, Multi-Family and Subdivision Certification Form and Checklist
Project Name:
Date:
Building Permit Numbers:
(Commercial or multi-family)
Per the requirement in Fort Collins Stormwater Criteria Manual (FCSCM) Volume 1, Section 6.11, please fill in
all applicable items in this Certification Form for Commercial, Multi-Family and Overall Single Family sites.
NOTE: several items must be verified during construction. A copy of the approved grading plan must be
submitted with the as-built grading plan. (As-built elevations must be written in red next to the approved
elevations.)
•Use “Yes” for items completed as described.
•Use “N/A” for items that are not applicable to the site being certified.
•If any blanks are “No,” attach an explanation referencing the item number below.
Attach an explanation or description of the as-built condition for any items listed or for anything not listed but
shown on the approved construction plans.
Provide an as-built redline or Mylar drawing with the following:
I.Water Quality and Quantity Detention Basin Certification - FCSCM Vol.2, Ch.10
For multiple detention basins on a site, provide the following for each basin separately:
A. Volume: As-built topographic verification is attached at 1-foot (or less) contour intervals and
volume verification calculations for the water quality capture volume and the 100-year detention storage
volume.
1. Detention basin topography was prepared by a professional land surveyor registered in the state
of Colorado.
2.Both proposed and as-built contours are shown on the same plan sheet (dashed lines for
proposed and solid lines for as-built).
3.All critical spot elevations as shown on the approved construction plans have been verified and
the as-built elevations are shown on the plan sheet.
4.Stage-storage-discharge tables are provided on a separate document.
5.Verification that designed drain time is in compliance with Colorado Revised Statute § 37-92-
602(8) is attached and has been uploaded to the Statewide Compliance Portal
(tinyurl.com/COCompliancePortal) for approval. Uploaded documents must include:
a.The cover sheet from the approved drainage report
b.The stamped certification page from the approved drainage report
c.As-built topographic survey
d.Stamped certification page from the Overall Site & Drainage Certification
e.PDF output from the Stormwater Detention and Infiltration Design Data Speadsheet
PDF output included with this package; documents will be uploaded upon acceptance of this certification.
8/16 Page 2
B.Water Quality and Quantity Detention Basin Grading: Attached is as-built verification that there is
a minimum 2% positive fall into the concrete trickle pans or flow-line(s) from all areas in the bottom of
the detention pond. If there is a “soft pan” in the flow-line, all areas still must meet the minimum 2%
grade requirement.
1.Low Flow: Choose one of the following detention basin low flow options as applicable:
a. Turf swale for low flow path in detention basin.
There is a minimum 2% grade in the flow-line(s) of the detention basin. The flattest as-built grade
is .
b.Concrete pan for low flow in detention basin.
There is a concrete pan installed that meets the grades as shown on the approved construction
plans. (Show as-built spot elevations.)
c.Soft pan for low flow in detention basin.
•Verify and document the soft pan material gradation, trench width and depth - to be verified
during construction by engineer. Picture documentation is preferred or engineer’s statement of
visual inspection and compliance. (Choose one below.)
o There is a soft pan with an underdrain installed that meets the design on the approved
construction plans. (Show the underdrain grades, bedding material, geotextile, spot elevations,
bends, cleanouts, etc.)
o There is soft pan installed without an underdrain but there is a type A or B soil. The soil
type must be documented by supplying verification from a registered professional geotechnical
engineer.
NOTE: Spot elevations are to be within 0.2 ft. +/-.
2. Side Slopes: The as-built side slopes of the detention basin have been calculated and are shown.
Indicate the side slope with an arrow and a numerical value (e.g., 6.25:1). The maximum slope allowed
is 4:1. Small areas of 3:1 may be acceptable, but slopes steeper than 3:1 must be stabilized or re-
graded. Provide documentation if a variance was granted for steeper slopes during the design process.
3.Spillway Certification: The following items must be field verified:
a.The location of the spillway is indicated on the as-built plan.
b.The width of the spillway is indicated on the as-built plan.
c.The elevation(s) of the spillway is shown on the as-built plan.
d.A concrete ribbon defines the location and grade of the spillway.
e.There is downstream scour protection in the spillway as per the construction plans. Indicate
type: (riprap size “D50” gradation and bedding type, geotextile, buried
riprap with inches of bury, etc.).
f.There are no obstructions in the spillway, such as trees, bushes, sidewalks, landscape
features, rocks, etc.
Per approved drainage plan, minimum 1.0% fall in turf swale.
Per approved drainage plan, minimum 1.0% fall to turf swale.
8/16 Page 3
4.Outlet Structure Certification
a.The orifice plate for the approved release rate is installed with the correct size and location of
the orifice.
b.The orifice plate for the water quality outlet is installed with the correct hole size, number of
rows and columns of holes.
c.The bottom hole on both the water quality and quantity outlets are at the bottom of the plate
so no water ponds in front of the plate.
d.The well screen is the correct material and is installed as shown on the construction plans.
e.100-year overflow grate elevation is . (Elev. A on detail D-46)
f.The top elevation of the water quality capture volume is . (Elev. B on detail
D-46)
g.Overflow grate is made of the correct material, has the correct bar spacing, is hinged at the
top and bolted at the bottom.
h.The bottom of the outlet box has no obstructions or misalignments that will cause it to retain
runoff water and is sloped at 2% towards outlet.
II.Channels/Swales - FCSCM Vol.1, Ch.7, Sect.3&4
A. Capacity: The as-built capacity of all the major channels and swales has been verified. They meet
or exceed capacity requirements shown in the approved drainage study for this project.
1.All swales are located within the drainage easements as shown on the construction plans.
2.Longitudinal slopes and side-slopes (cross-sections) have been verified. Design criteria requires
longitudinal slopes of 2% min. (on vegetated swales) and side-slopes no steeper than 4:1. If these
criteria are not met, the certification engineer will write a justification and propose mitigation for each
instance or have the issues corrected. If variances to these criteria have previously been approved and
are shown on the construction plans, no justification is needed.
3.As-built spot elevations on channels/swales are shown that correspond to spot elevations
shown on the approved construction plans.
4.All permanent erosion control measures are installed as shown on the approved construction
plans (e.g., drop structures, riprap, TRMs, etc.). (Include pictures and verification of the materials used
as part of this verification.)
5.All pans, curbs, storm pipes or other appurtenances appropriately tie into each other in the
system. (Pictures at tie-in points suggested.)
6.The minimum freeboard is provided for all channels and swales as shown on the approved
construction plans or as identified in the approved drainage study. (Show the freeboard provided on
the cross-sections as on the construction plan set or attached as separate documentation.)
7.The low flow portion of all channels or swales is clear of obstructions. (No landscaping, trees,
shrubs, sod, etc. infringe on the low flow portion of channels or swales.)
Per the approved plans, there is a water quality
sump in the bottom of the box (as-built elev is
1.76' below the 15" outlet pipe invert).
8/16 Page 4
III.Storm Pipes (aka storm drains) - FCSCM Vol.1, Ch.6, Sec. 4
A. Storm Drain Pipe Capacity: The as-built capacity of all pipes installed on this project has been
verified and meets or exceeds the capacity requirements shown in the approved drainage study for this
project.
1.All storm drain pipe sizes and materials have been verified and are in conformance with the
approved construction plans. (Indicate on the plan and profile sheets that they have been verified.)
Material and size substitutions must be approved prior to installation. If a pipe size or material was
changed during construction, the certification engineer must attach the approval documents or supply
them with this certification. Approval documents must include a calculation documenting the capacity
equivalency (equal or greater) of the substituted size.
2.The longitudinal slope of the pipe is as shown on the approved construction plans. The
acceptable minimum slope is 0.4%. All slopes flatter than the designed slope on the construction plans
must be justified with capacity calculations on an attached sheet.
3.The as-built invert elevations have been verified and are shown on the plan and profile sheets of
the approved construction plans.
B.Storm Drain Pipe Installation Requirements: All pipes are installed in accordance with the
approved construction plans.
1.The minimum cover requirements for all pipes have been met as shown on the approved
construction plans. These will be called out in critical locations.
2.All encasements and clearances as specified on the approved construction plans have been met.
3.Any specific joint types or construction methods specified on the approved construction plans
have been met. (List on a separate sheet and attach to this certification.)
IV.Concrete Pans - FCSCM Vol.1, Ch.7, Sec.4.1.3.4
A. Construction/Installation: All concrete pans have been constructed in accordance with the
approved construction plans.
1.The concrete pans are the correct size/width as shown on the approved construction plans.
2.The longitudinal slopes of the pans are as shown on the approved construction plans. The
certification engineer must justify or mitigate longitudinal slopes less than the minimum of 0.4% unless
a flatter slope was approved and is shown on the approved construction plans. Provide mitigation or
justification by separate document.
3.The cross-section of the pan is as shown on the construction plans. (Specifically, the pan cross-
section is “V” shaped and meets the side slope shown on the detail.)
4.The concrete pans are a minimum of 6 inches thick without reinforcement and a minimum of 4
inches thick with a minimum of 6X6-W14xW14 reinforcement per detail D20B and D20C. (Provide
documentation of the reinforcement used if different than shown on the details or on the approved
construction plans.)
5.The spot elevations shown on the concrete pan(s) have been verified and are shown on the as-
built drawings.
8/16 Page 5
V. Storm Drain Inlets - FCSCM Vol.1, Ch.6, Sec. 3
A. Construction/Installation: All storm drain inlets have been constructed in accordance with the
approved construction plans.
1.The size and type of inlets are consistent with the inlets shown on the approved construction
plan. Indicate by writing “Verified” on each inlet on the plan sheet or list on a separate document the
inlet number(s), type and size (length). If the inlet installed is other than the one on the approved
construction plan detail sheet, provide the name and source of the detail with justification for equal or
better capacity.
2.The size of the inlet opening is consistent with the approved detail. (Check height and width.)
3.The elevation of the grate (if applicable) is at the elevation shown on the street profile or as
indicated by a spot elevation on the construction plans.
4.The as-built invert elevations of all pipes entering and leaving the inlet are shown on the plan
and profile sheets within construction tolerance of 0.2 feet. If substantially different, provide
justification and capacity calculations to show the capacity is not affected or propose mitigation.
5.The as-built size of the inlet box is as shown on the construction plans or an explanation or
justification is attached.
6.All Type C, R, 13 and 16 inlet covers are stenciled or stamped with the following (or an
equivalent) designation: NO DUMPING – DRAINS TO POUDRE RIVER.
VI.Culverts - FCSCM Vol.2, Ch.9
A. Construction/Installation: All culverts have been constructed and/or installed in accordance with
the approved construction plans.
1.All culvert sizes have been verified as indicated on the as-built construction plans as correct.
2.The culvert material type for all culverts installed is as on the approved construction plans and is
indicated on the as-built plans.
3.The as-built invert “in and out” elevations have been verified and are indicated on the as-built
construction plans.
4.The culvert headwalls or wing walls have been installed as shown on the approved construction
plans. Headwalls or wing walls may be needed in the as-built conditions onsite if the slopes adjacent to
the culvert are greater than 4:1. Please note areas needing stabilization in the certification narrative.
An alternative to consider is a turf reinforcement mat (TRM).
VII.Sub-Drains
A. Construction/Installation: All sub-drains shown on the construction plans have been installed in
accordance with those plans. Sub-drains installed with the sanitary sewer are to be verified on the
sanitary sewer plan and profile sheets of the construction plans. (NOTE: Indicate any sub-drains installed
after the plans were approved on the as-built plans.)
1.The size of the sub-drains are as approved on the construction plans and are indicated on the as-
built plans.
2.The type of sub-drain, in particular the perforated and non-perforated sections of the drain, are
as indicated on the approved construction plans.
8/16 Page 6
3.The cover requirements per the construction plans are provided.
4.The cleanouts have been installed at the locations shown on the construction plans and are
accessible for cleaning. (Cleanouts can be buried a maximum of 6 inches deep with their locations
marked.)
5.The backfill materials for sub-drains are as shown on the approved construction plans. (This
includes the type, depth and width.)
6.The geo-textile liner completely wraps the sub-drain and the permeable backfill material unless
shown otherwise on the approved construction plans. (Sub-drain pipe wrapped in a sock filter material
is accepted only if approved prior to installation.)
VIII.Curb Cuts
A. Construction: All curb cut openings are constructed in accordance with the approved construction
plans.
1.The size (width) of the curb cut opening is as shown on the approved construction plans.
2.The curb cut openings tie into a downstream swale, pipe, or other appurtenances with a smooth
transition and there no obstructions such as riprap or sod impeding the flow downstream of the curb
cut.
IX.Sidewalk Culverts & Chases
A. Construction/Installation: All sidewalk culverts have been installed at the locations shown on the
approved construction plans.
1.The size (width and length) of the culverts are as shown on the approved construction plans.
2.The cover plate is a minimum 5/8-inch galvanized plate bolted to a galvanized angle iron per the
detail shown on the approved construction plans or per the City’s detail.
3.The sidewalk culvert invert “in and out” elevations have been verified and are indicated on the
as-built plans.
4.The sidewalk culvert opening is as shown on the approved construction plans or per the City’s
detail.
5.There is a smooth transition both on the inlet and outlet ends of the sidewalk culvert with no
obstructions such as riprap or sod impeding the flow into or out of the sidewalk culvert.
X. Site Grading
A. Construction: All common open spaces have been graded in accordance with the approved
construction plans.
1.The grading on all common open spaces bordering private lots has been verified as correct and
the as-built rear lot corner elevations have been shown on the as-built plans.
Sidewalk chase in central turf play area is not completed in order to allow
access for landscaping work still ongoing at the time of this certification.
8/16 Page 7
2.The as-built contours for “overlot grading” are shown on the as-built construction plans for all
common open spaces, tracts, outlots, etc. If not in compliance, please attach a narrative describing the
situation for noncompliance and when it may be corrected. An escrow for overlot grading may be
required. (NOTE: Residential Lot Grading Certification is a separate process from this Overall Site
Certification. It is understood that residential lots will be brought to final grade once the foundation is
backfilled so they may be lower than the plan shows at this Overall Site Certification stage.)
3.All turf reinforcement mats (TRMs) have been installed as shown on the approved construction
plans and the slopes are stabilized.
XI.Riprap - FCSCM Vol.1, Ch.7, Sec.4.4.4.3
A. Construction: All riprap has been installed in the locations and sizes indicated on the approved
construction plans.
XII.Permanent Erosion Control Fabric - FCSCM Vol.1, Ch.7
A. Construction: All fabric has been installed in the locations and sizes indicated on the approved
construction plans.
1.All fabric was installed per the details on the approved construction plans.
XIII.Post-Construction Site Cleanup - FCSCM Vol.3, Ch.7
A. Construction: All construction debris and obstructions of any kind have been removed from
drainage paths.
1.All construction debris has been removed except in staging area(s).
2.All ruts have been smoothed out in all construction areas.
3.All areas needing reseeding have been identified and future stabilization goals have been
coordinated with the Erosion Control Inspector and in accordance with FCSCM Vol.2 Chapter 12. Note
the area needing stabilization in the narrative.
XIV.Certification of Other Permanent BMPs - FCSCM Vol.2, Ch.8, Sec.2 & FCSCM Vol.2, Ch.12
A.The construction of channel drop structures is in accordance with the approved plan both in
location, horizontal dimensions and cross-section.
XV.Certification of LID and Water Quality Facilities - FCSCM Vol.3, Ch.4
A.Attached are the During Construction Inspection Checklist for Low Impact Development (LID) and
other items to be verified during construction, along with pictures and other required documentation.
8/16 Page 8
XVI. Certification and Erosion Control Measures
A. All temporary erosion control measures shall be removed upon stabilization. If at the time of preparing
this certification there are any erosion control measures still remaining on the site, please note them in
the narrative and verify that they need to remain at this time. If in doubt as to the need for any control
measure, please consult with the Erosion Control Inspector at 970-221-6700.
XVII.Statement of Compliance
A. This certification is signed and stamped. By signing this form, the engineer(s) attests that he/she has
visited and observed the site, and to the best of his/her knowledge, the as-built conditions of the drainage
facilities are as described in the above form and in the enclosed as-built plans.
B.Failure to properly disclose all known information could result in the rejection of this certification and
prevent the release of any and all Stormwater Utility permit holds on Building Permits and/or Certificates
of Occupancy within this development.
XVIII.Signature and Stamp by a Colorado-Registered Professional Engineer
Engineer’s contact information:
Name:
Email:
Phone:
Company:
Address:
PE Stamp
2018-09-25
12/15 Page 1
DURING CONSTRUCTION INSPECTION CHECKLIST
To be completed by Construction Superintendent
This checklist is to be completed during construction and included with the Overall Site and Drainage Certification.
•Use “Yes” for items completed as described.
•Use “N/A” for items that are not applicable to the site being certified.
•If any blanks are “No,” attach an explanation referencing the item number below.
I.Compaction
A.All berms and embankments meet the compaction requirements as specified in the project geotechnical report or comply with the
City’s standard, which is “soils should be compacted within a moisture content range of 2% below to 2% above optimum moisture content
and compacted to 95% of the Maximum Standard Proctor Density (ASTM D698).” Compaction requires verification during construction.
Provide testing log from contractor/engineer.
II.Storm Drain Pipe Installation Requirements
A.The pipe trenches have been compacted in accordance with Section 02225-3.07.A.1. of the Fort Collins Development Construction
Standards (e.g., the trenches in the roadways are to be 95% of maximum density and all other areas are to be at 90%, both in accordance
with ASTM D698).
III. Riprap - FCSCM Vol.1, Ch.7, Sec.4.4.4.3
A.The riprap bedding is a granular bedding of the gradation and thickness indicated on the approved construction plans.
B.A filter fabric was installed instead of granular bedding and is the material shown on the approved construction plans or was an
approved equal. Provide documentation for an approved equal.
C.The riprap is the gradation shown on the approved construction plans with a D50 of .
D.The riprap thickness is as shown on the approved construction plans and extends to the horizontal limits shown.
E.The riprap is buried to the depth indicated on the approved construction plans. (A minimum of 6 inches of soil is required.)
IV. Permanent Erosion Control Fabric - FCSCM Vol.1, Ch.7
A.All fabric was installed per manufacturer’s specifications.
V. Certification of Other Permanent BMPs - FCSCM Vol.2, Ch.8, Sec.2 & FCSCM Vol.2, Ch.12
A.All cut-off walls have been installed in accordance with the approved construction plans. (Cut-off walls are required for irrigation
ditch crossings of storm drain pipes and at the end of flared end sections.)
12/15 Page 2
Permeable Interlocking Concrete Pavers
Post-excavation infiltration rates are consistent with design
infiltration capacity (for “full or partial infiltration” designs)
Impermeable liner meets design specifications
Impermeable liner attached to concrete perimeter wall
Impermeable liner is not exposed
Any penetrations of the impermeable liner have been sealed
and checked for water-tightness.
Meets specifications for:
-Dimensions
-Reinforcement
-Footings
Underdrain pipe is per design specifications
At least one cleanout is provided per underdrain lateral
Cleanout pipe is not perforated
Cleanout covers are installed and watertight
Underdrain is NOT wrapped in geotextile fabric
Underdrain orifice plate installed at outlet structure
Underdrain integrity tested after backfilling using TV and/or
water test
Base coarse (e.g., #2/4) has 90% fractured faces
Bedding coarse (e.g., #89) is thoroughly washed
Sub-base materials are installed and compacted according to
manufacturer’s specifications
PICP area is protected from construction site sediment,
including runoff from the upstream catchment and
Close Out
12/15 Page 3
Bioretention Cells
Heavy equipment did not travel over bioretention cell during
excavation
Bottom of cell was “ripped” after excavation Photograph before/after “ripping”
Bottom of cell is flat and level Photograph
Excavated area is protected/surrounded by sediment/runoff
control BMPs during construction
Photograph
Overflow inlet elevation is set above bioretention media per
plan (typically 12 inches)
Overflow inlet invert elevation is at least 3 inches below
containment wall/berm (to direct overflow into inlet)
Measure/record distance between inlet and top of
containment wall/berm
Upstream catchment drains to inlet
Forebay is installed according to design specifications
Forebay has flat, concrete bottom
Outlet structure/overflow elevation is confirmed Measure/record distance from overflow to top of media
filter
Impermeable liner meets design specifications
Impermeable liner attached to concrete perimeter wall
Impermeable liner is not exposed
Underdrain pipe is per design specifications
At least one cleanout is provided per underdrain lateral
Cleanout pipe is not perforated
Cleanout covers are installed and watertight
Underdrain is NOT wrapped in geotextile fabric
Underdrain orifice plate installed at outlet structure
Underdrain integrity tested after backfilling using TV and/or
water test
12/15 Page 4
Filter Media
Filter media composition is per design specifications
Filter media was “machine mixed” by supplier prior to delivery
Filter media installed flat and level
Other Structural Components
Containment wall/berm is continuous and level
Landscaping
Final landscaping does NOT include sod
Final landscaping (wood/rock mulch) is flat and level
Vegetation is planted according to landscape design
specifications
Verify that weed barrier is not installed
Temporary irrigation installed If N/A, then verify that permanent irrigation is installed to
establish/maintain vegetation
Close Out
Upstream catchment stabilized prior to diverting runoff into
bioretention cell
Signature:
Name:
Title:
Email:
Phone:
Company:
Address:
Landscaping work in ongoing at time of this certification
Permanent irrigation system will be
installed with final landscaping
Attachment B:
Original Approved Grading Plans
Attachment C:
Redlined As-built Grading Plans
X
X
X
X
X
X
X
X
X
X
X
X
X
X
DRAWING NUMBER:
419 Canyon Ave. Suite 200 Fort Collins, CO 80521
phone 970.224.5828 | fax 970.225.6657 | www.ripleydesigninc.com
■ land planning ■ landscape architecture ■
■ urban design ■ entitlement ■
ISSUED
PROJECT No.:
DRAWN BY:
REVIEWED BY:
SEAL:
PREPARED BY:
No.DESCRIPTION DATE
REVISIONS
No.DESCRIPTION DATE
Pl
o
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g
ORIGINAL SIZE 24X36
RIPLEY DESIGN INC.
Project Manager
419 Canyon Ave. Suite 200
Fort Collins, CO 80521
p. 970.224.5828
f. 970.225.6657
HOUSING CATALYST
1715 W Mountain Avenue
Fort Collins, CO 80521
p. 970.416.2910
CIVIL ENGINEER
ARCHITECT
APPLICANT
JVA, INCORPORATED
25 Old Town Square, Suite 200
Fort Collins, CO 80524
p. 970.225.9099
OZ ARCHITECTURE
3003 Larimer Street
Denver, CO 80205
p. 303.861.5704
OWNER/DEVELOPER
VILLAGE ON
HORSETOOTH
FINAL
DEVELOPMENT PLAN
FORT COLLINS, CO
JVA, Incorporated
2 1 3 L i n d e n S t r e e t
Suite 200
Fort Collins, CO 80524
Phone: 970.225.9099
Fax: 970.225.6963
E-mail: info@jvajva.com
JVA Project #2595c
CONSULTING ENGINEERS
1 FDP 10/26/2016
R16-028
EJK/KRB
BJC/CRH
2 12/14/2016FDP #2
3 01/13/2017FDP PDF
4 03/24/2017MYLARS
1 09/27/2017MINOR AMENDMENT
C1.1
DETAILED GRADING &
DRAINAGE PLAN
CHECKED BY:
CHECKED BY:
CHECKED BY:
CHECKED BY:
CHECKED BY:
Date
Date
Date
Date
Date
Date
City of Fort Collins, Colorado
UTILITY PLAN APPROVAL
Parks and Recreation
Traffic Engineer
Stormwater Utility
Water & Wastewater Utility
City Engineer
CHECKED BY:
APPROVED:
Date
Environmental Planner
CONFORMED TO CONSTRUCTION RECO
5110.20
5104.55
5110.44
5104.47
5104.47
96.41 LF 0.08%
DRAWING NUMBER:
419 Canyon Ave. Suite 200 Fort Collins, CO 80521
phone 970.224.5828 | fax 970.225.6657 | www.ripleydesigninc.com
■ land planning ■ landscape architecture ■
■ urban design ■ entitlement ■
ISSUED
PROJECT No.:
DRAWN BY:
REVIEWED BY:
SEAL:
PREPARED BY:
No.DESCRIPTION DATE
REVISIONS
No.DESCRIPTION DATE
Pl
o
t
t
e
d
B
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:
Ka
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B
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_
a
s
-
b
u
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l
t
.
d
w
g
ORIGINAL SIZE 24X36
RIPLEY DESIGN INC.
Project Manager
419 Canyon Ave. Suite 200
Fort Collins, CO 80521
p. 970.224.5828
f. 970.225.6657
HOUSING CATALYST
1715 W Mountain Avenue
Fort Collins, CO 80521
p. 970.416.2910
CIVIL ENGINEER
ARCHITECT
APPLICANT
JVA, INCORPORATED
25 Old Town Square, Suite 200
Fort Collins, CO 80524
p. 970.225.9099
OZ ARCHITECTURE
3003 Larimer Street
Denver, CO 80205
p. 303.861.5704
OWNER/DEVELOPER
VILLAGE ON
HORSETOOTH
FINAL
DEVELOPMENT PLAN
FORT COLLINS, CO
JVA, Incorporated
2 1 3 L i n d e n S t r e e t
Suite 200
Fort Collins, CO 80524
Phone: 970.225.9099
Fax: 970.225.6963
E-mail: info@jvajva.com
JVA Project #2595c
CONSULTING ENGINEERS
1 FDP 10/26/2016
R16-028
EJK/KRB
BJC/CRH
2 12/14/2016FDP #2
3 01/13/2017FDP PDF
4 03/24/2017MYLARS
1 09/27/2017MINOR AMENDMENT
C1.2
DETAILED GRADING &
DRAINAGE PLAN
CHECKED BY:
CHECKED BY:
CHECKED BY:
CHECKED BY:
CHECKED BY:
Date
Date
Date
Date
Date
Date
City of Fort Collins, Colorado
UTILITY PLAN APPROVAL
Parks and Recreation
Traffic Engineer
Stormwater Utility
Water & Wastewater Utility
City Engineer
CHECKED BY:
APPROVED:
Date
Environmental Planner
CONFORMED TO CONSTRUCTION RECO
5104.17
5104.17
5109.53
5109.63
5104.17
5104.17
29.34 LF
26.67 LF
5109.53
5104.05
5104.05
0.45%
53.65 LF
5109.67
5104.05
5104.05
5108.99
5103.57
5103.57
159.73 LF 0.30%
ON
L
Y
DRAWING NUMBER:
419 Canyon Ave. Suite 200 Fort Collins, CO 80521
phone 970.224.5828 | fax 970.225.6657 | www.ripleydesigninc.com
■ land planning ■ landscape architecture ■
■ urban design ■ entitlement ■
ISSUED
PROJECT No.:
DRAWN BY:
REVIEWED BY:
SEAL:
PREPARED BY:
No.DESCRIPTION DATE
REVISIONS
No.DESCRIPTION DATE
Pl
o
t
t
e
d
B
y
:
Ka
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e
P
l
a
n
_
a
s
-
b
u
i
l
t
.
d
w
g
ORIGINAL SIZE 24X36
RIPLEY DESIGN INC.
Project Manager
419 Canyon Ave. Suite 200
Fort Collins, CO 80521
p. 970.224.5828
f. 970.225.6657
HOUSING CATALYST
1715 W Mountain Avenue
Fort Collins, CO 80521
p. 970.416.2910
CIVIL ENGINEER
ARCHITECT
APPLICANT
JVA, INCORPORATED
25 Old Town Square, Suite 200
Fort Collins, CO 80524
p. 970.225.9099
OZ ARCHITECTURE
3003 Larimer Street
Denver, CO 80205
p. 303.861.5704
OWNER/DEVELOPER
VILLAGE ON
HORSETOOTH
FINAL
DEVELOPMENT PLAN
FORT COLLINS, CO
JVA, Incorporated
2 1 3 L i n d e n S t r e e t
Suite 200
Fort Collins, CO 80524
Phone: 970.225.9099
Fax: 970.225.6963
E-mail: info@jvajva.com
JVA Project #2595c
CONSULTING ENGINEERS
1 FDP 10/26/2016
R16-028
EJK/KRB
BJC/CRH
2 12/14/2016FDP #2
3 01/13/2017FDP PDF
4 03/24/2017MYLARS
1 09/27/2017MINOR AMENDMENT
C1.3
DETAILED GRADING &
DRAINAGE PLAN
CHECKED BY:
CHECKED BY:
CHECKED BY:
CHECKED BY:
CHECKED BY:
Date
Date
Date
Date
Date
Date
City of Fort Collins, Colorado
UTILITY PLAN APPROVAL
Parks and Recreation
Traffic Engineer
Stormwater Utility
Water & Wastewater Utility
City Engineer
CHECKED BY:
APPROVED:
Date
Environmental PlannerCONFORMED TO CONSTRUCTION RECO
DRAWING NUMBER:
419 Canyon Ave. Suite 200 Fort Collins, CO 80521
phone 970.224.5828 | fax 970.225.6657 | www.ripleydesigninc.com
■ land planning ■ landscape architecture ■
■ urban design ■ entitlement ■
ISSUED
PROJECT No.:
DRAWN BY:
REVIEWED BY:
SEAL:
PREPARED BY:
No.DESCRIPTION DATE
REVISIONS
No.DESCRIPTION DATE
Pl
o
t
t
e
d
B
y
:
Ka
r
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n
R
.
B
r
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g
m
a
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La
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:
C1
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D
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P
l
a
n
_
a
s
-
b
u
i
l
t
.
d
w
g
ORIGINAL SIZE 24X36
RIPLEY DESIGN INC.
Project Manager
419 Canyon Ave. Suite 200
Fort Collins, CO 80521
p. 970.224.5828
f. 970.225.6657
HOUSING CATALYST
1715 W Mountain Avenue
Fort Collins, CO 80521
p. 970.416.2910
CIVIL ENGINEER
ARCHITECT
APPLICANT
JVA, INCORPORATED
25 Old Town Square, Suite 200
Fort Collins, CO 80524
p. 970.225.9099
OZ ARCHITECTURE
3003 Larimer Street
Denver, CO 80205
p. 303.861.5704
OWNER/DEVELOPER
VILLAGE ON
HORSETOOTH
FINAL
DEVELOPMENT PLAN
FORT COLLINS, CO
JVA, Incorporated
2 1 3 L i n d e n S t r e e t
Suite 200
Fort Collins, CO 80524
Phone: 970.225.9099
Fax: 970.225.6963
E-mail: info@jvajva.com
JVA Project #2595c
CONSULTING ENGINEERS
1 FDP 10/26/2016
R16-028
EJK/KRB
BJC/CRH
2 12/14/2016FDP #2
3 01/13/2017FDP PDF
4 03/24/2017MYLARS
1 09/27/2017MINOR AMENDMENT
C1.4
DETAILED GRADING &
DRAINAGE PLAN
CHECKED BY:
CHECKED BY:
CHECKED BY:
CHECKED BY:
CHECKED BY:
Date
Date
Date
Date
Date
Date
City of Fort Collins, Colorado
UTILITY PLAN APPROVAL
Parks and Recreation
Traffic Engineer
Stormwater Utility
Water & Wastewater Utility
City Engineer
CHECKED BY:
APPROVED:
Date
Environmental PlannerCONFORMED TO CONSTRUCTION RECO
5109.88
5103.74
5103.74
39.4
3
L
F
0.30
%
20.0'
Attachment D:
Redlined As-built Storm Drain Plans
N:1439317.4
E:3110123.0
N:1439250.6
E:3110122.6
N:1439068.3
E:3110157.0
51
0
6
.
5
7
0.87%
51
0
3
.
6
2
51
0
5
.
3
8
51
0
9
.
2
6
51
0
4
.
8
3
51
0
4
.
7
3
51
0
7
.
0
5
51
0
4
.
5
0
0.11%
CERTIFICATION
I, STACY LYNN JACOBS, A PROFESSIONAL LAND SURVEYOR
LICENSED IN THE STATE OF COLORADO, DO HEREBY CERTIFY THAT
THE AS-BUILT DIMENSIONS OF THE FACILITIES AS SHOWN, ARE
BASED UPON AN ACTUAL SURVEY MADE ON THE GROUND, AND THAT
THE FIELD WORK WAS PERFORMED UNDER MY DIRECT
SUPERVISION ON AUGUST 24, 2018.
STACY LYNN JACOBS, PLS
COLORADO REG. NO. 38495
FOR, AND ON BEHALF OF:
R&R ENGINEERS-SURVEYORS, INC.
710 W. COLFAX AVENUE
DENVER, CO 80204
(303) 753-6730
09/17/2018
CONFORMED TO CONSTRUCTION RECO
51
1
0
.
1
6
51
0
7
.
8
6
51
0
9
.
3
4
51
0
7
.
5
0
51
0
9
.
3
4
51
0
7
.
2
8
51
1
1
.
5
5
51
0
6
.
9
5
51
0
7
.
5
0
51
0
7
.
2
8
NOT
MEASURED
NOT
MEASURED
113 LF @ 0.29%
51
0
6
.
9
5
51
1
1
.
3
8
51
0
6
.
7
8
51
0
6
.
7
8
51
1
1
.
0
0
51
0
6
.
6
2
51
0
6
.
6
2
51
1
0
.
9
0
51
0
6
.
5
5
51
0
6
.
5
5
51
0
6
.
5
5
51
0
6
.
5
5
0.16%
0.59%
0.47%0.31%0.39%
N:1439645.3
E:3109761.8
N:1439594.7
E:3109841.3
N:1439524.5
E:3109840.7
N:1439485.8
E:3109901.0
FL 5100.00
INV 5100.00
N:1439442.4
E:3109917.8
N:1439413.1
E:3109894.9
N:1439385.8
E:3109895.3
N:1439349.5
E:3109914.9
NOT FOUND
CERTIFICATION
I, STACY LYNN JACOBS, A PROFESSIONAL LAND SURVEYOR
LICENSED IN THE STATE OF COLORADO, DO HEREBY CERTIFY THAT
THE AS-BUILT DIMENSIONS OF THE FACILITIES AS SHOWN, ARE
BASED UPON AN ACTUAL SURVEY MADE ON THE GROUND, AND THAT
THE FIELD WORK WAS PERFORMED UNDER MY DIRECT
SUPERVISION ON SEPTEMBER 19, 2018.
STACY LYNN JACOBS, PLS
COLORADO REG. NO. 38495
FOR, AND ON BEHALF OF:
R&R ENGINEERS-SURVEYORS, INC.
710 W. COLFAX AVENUE
DENVER, CO 80204
(303) 753-6730
09/21/2018
CONFORMED TO CONSTRUCTION RECOCONFORMED TO CONSTRUCTION RECO
Inlet verified
Inlet verified Inlet verified
Inlet verified Inlet verified
Inlet verified
Inlet verified
Inlet verified
Inlet verified
Inlet verified
Inlet verified
Inlet verified Inlet verified
N:1439317.4
E:3110123.0
N:1439295.4
E:3109665.1
N:1439343.8
E:3109676.7
NOT MEASURED
0.27%
96 LF
FL 5110.11
INV 5107.81
FL 5111.59
INV 5107.89
N:1439345.6
E:3109800.0
N:1439349.5
E:3109914.9
N:1439294.3
E:3109875.4
N:1439321.2
E:3109895.0
FL 5109.82
INV (FULL OF DEBRIS)
FL 5111.59
IN(SW) 5107.36
OUT(NE) 5107.0932 LF
32 LF 1.69%
N:1439332.6
E:3110075.8
N:1439293.7
E:3110055.4
N:1439295.0
E:3110082.7
1.11%
1.33%
27 LF
44 LF
FL 5110.81
INV 5106.95
FL 5110.68
INV 5106.59
5106.10
5110.33
FL 5110.82
INV (FULL OF DEBRIS)
CONFORMED TO CONSTRUCTION RECO
51
1
1
.
0
4
51
0
7
.
5
5
51
0
7
.
5
0
51
0
9
.
4
2
51
0
7
.
0
4
51
0
6
.
9
6
0.35%133 LF
51
1
0
.
9
0
51
0
6
.
5
5
51
0
6
.
5
5
51
0
6
.
5
5
51
0
6
.
5
5
0.38%108 LF
51
0
6
.
2
5
NOT MEASURED
167 LF @ 0.18%
CERTIFICATION
I, STACY LYNN JACOBS, A PROFESSIONAL LAND SURVEYOR
LICENSED IN THE STATE OF COLORADO, DO HEREBY CERTIFY THAT
THE AS-BUILT DIMENSIONS OF THE FACILITIES AS SHOWN, ARE
BASED UPON AN ACTUAL SURVEY MADE ON THE GROUND, AND THAT
THE FIELD WORK WAS PERFORMED UNDER MY DIRECT
SUPERVISION ON AUGUST 24, 2018.
STACY LYNN JACOBS, PLS
COLORADO REG. NO. 38495
FOR, AND ON BEHALF OF:
R&R ENGINEERS-SURVEYORS, INC.
710 W. COLFAX AVENUE
DENVER, CO 80204
(303) 753-6730
09/17/2018
Inlet verified
Inlet verified
Inlet verified
Inlet verified
Inlet verified
Inlet verified
Inlet verified
Inlet verified
Attachment E:
PLS Stamped As-built Pond Survey
Attachment F:
PDF Output from the Stormwater Detention and
Infiltration Design Data Speadsheet
Stormwater Facility Name:
Facility Location & Jurisdiction:
User Input: Watershed Characteristics User Defined User Defined User Defined User Defined
Watershed Slope =0.010 ft/ft Stage [ft] Area [ft^2] Stage [ft] Discharge [cfs]
Watershed Length =590 ft 0.00 0 0.00 0.00
Watershed Area = 7.96 acres 1.00 2,054 0.80 0.04
Watershed Imperviousness = 52.6%percent 2.00 12,652 1.00 0.12
Percentage Hydrologic Soil Group A =percent 3.00 30,669 2.00 0.29
Percentage Hydrologic Soil Group B = 100.0%percent 4.00 46,936 3.00 0.55
Percentage Hydrologic Soil Groups C/D =percent 5.00 63,839 4.50 1.02
5.00 2.21
UDFCD Default 17
WQCV Treatment Method = 12.00 hours
After completing and printing this worksheet to a pdf, go to:
https://maperture.digitaldataservices.com/gvh/?viewer=cswdif
create a new stormwater facility, and
attach the pdf of this worksheet to that record.
Routed Hydrograph Results
Design Storm Return Period =WQCV 2 Year 5 Year 10 Year 50 Year 100 Year
One-Hour Rainfall Depth =0.53 0.95 1.34 1.64 2.32 2.61 in
Calculated Runoff Volume =0.112 0.299 0.507 0.683 1.178 1.405 acre-ft
OPTIONAL Override Runoff Volume =0.42 0.69 0.90 1.48 1.72 acre-ft
Inflow Hydrograph Volume =0.112 0.419 0.686 0.903 1.476 1.724 acre-ft
Time to Drain 97% of Inflow Volume =12.5 19.6 24.4 28.1 36.2 39.1 hours
Time to Drain 99% of Inflow Volume =14.3 23.2 28.4 31.9 39.4 42.2 hours
Maximum Ponding Depth =1.58 2.46 2.90 3.19 3.81 4.04 ft
Maximum Ponded Area =0.186 0.481 0.662 0.773 1.004 1.089 acres
Maximum Volume Stored =0.090 0.370 0.621 0.826 1.376 1.612 acre-ft
Location for 1-hr Rainfall Depths (use dropdown):
Workbook Protected Worksheet Protected
Stormwater Detention and Infiltration Design Data Sheet
Village on Horsetooth Detention Pond
1506 West Horsetooth Road, Fort Collins, 80525. Jusridiction is City of Fort Collins.
2595c - SDI_Design_Data_v1.04, Design Data 9/27/2018, 9:02 AM
Doing_Clear_Formatting =Yes
CountA=1
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Area
Discharge
Stormwater Detention and Infiltration Design Data Sheet
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5
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25
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45
0.1 1 10
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TIME [hr]
100YR IN
100YR OUT
50YR IN
50YR OUT
10YR IN
10YR OUT
5YR IN
5YR OUT
2YR IN
2YR OUT
WQCV IN
WQCV OUT
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
0.1 1 10 100
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N
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I
N
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DRAIN TIME [hr]
100YR
50YR
10YR
5YR
2YR
WQCV
2595c - SDI_Design_Data_v1.04, Design Data 9/27/2018, 9:02 AM